Here are Top 15 Angular basic interview questions along with their answers.
Angular is a powerful front-end JavaScript framework that is frequently utilized in the creation of apps. Because of its growing popularity, Angular developers are in high demand. In this blog post we have covered some frequently asked Angular interview questions. We have classified the questions based on experience levels and have added scenario based and interview questions on Angular as well.
Angular basic interview questions
A set of basic Angular interview questions is a great source for a recruiter or someone who is preparing for an interview. Here are top 10 Angular interview questions along with their answers. Interviewers frequently ask these questions to potential Angular developers to gauge their level of fundamental understanding of the framework. The questions in this section help you in grasping the fundamental ideas of Angular programming. The top Angular basic interview questions are below.
Also read: 10 Common Job Interview Questions and How to Answer Them
1. Explain data binding in Angular and what are its forms?
Data binding is a technique for defining how a component and DOM will communicate. As a result, creating interactive applications is simple and doesn’t need retrieving or sending data. You can use Angular’s data binding to consider the model as a single source and any modifications to the model will be immediately projected into view. There four types of data binding depending on the way data flows –
- String Interpretation
- Property Binding
- Event Binding
- Two-way data binding.
2. What are directives?
Directives are the best properties for changing the DOM’s behavior when rendering a template. The directives let you specify how DOM elements should behave, or just what will happen when the mouse is hovered over or clicked. Built-in directives start with ng-prefix, some built-in directives start with ngif and ngFor. You can always write your own directives to suit your own demand.
3. What is the latest version of Angular and how it is different from Angular Js?
The latest version of Angular 14 was released on June 2022. Google developed Angular JS it is the most primitive version Angular. Difference are as follows –
- The primitive AngularJS is based on JavaScript while Angular uses Typescript. While both Angular and AngularJS use Directives, how they use them makes the difference.
- Angular has standard Directives while AngularJS has a pack of them.
- Angular provides mobile support while AngularJS does not provide mobile support.
- AngularJS supports Model-view-controller design while Angular uses components and directives.
4. What is Do Bootstrap (ng BootStrap) in Angular?
Do Bootstrap is a new life-cycle hook for manual bootstrapping of the applications instead of using bootstrap array in @NgModule annotation.
5. What are the key components of Angular?
The key components of Angular are components, modules, services, and Metadata.
- Components are fundamental units that manage HTML views.
- Module are a collection of building blocks – components, directives, and others. Each logical section of code is called Module.
- Template show the view of the Angular application.
- Metadata allows you to add more data in an Angular class.
6. What is deep linking in Angular?
Deep linking is a technique of directing users to specific page without going to the home page of the website. Coders use deep linking in Angular to effortlessly link their pages in search engines.
7. Explain ng-content, ng-container and ng- template?
The <ng-template> is a template element that Angular uses with structural directives (*ngIf, *ngFor, [ngSwitch] and custom directives).
The <ng-container> is a grouping element.
As Angular doesn’t put it in DOM, it does not interfere with styles or layout.
The <ng-content> is used to create configurable components. It can create components that can be configured depending on the needs of its user. Components that are used in published libraries make use of <ng-content> to make themselves configurable.
8. What is lazy loading?
Lazy loading is a technique used to load JavaScript components when a particular route is active. This technique is effective when you have numerous components because it increases performance during the first load. Thanks to lazy loading, the most recent versions of Angular allow applications to be load modules only when required. Other benefits of lazy loading are enhancing the application’s size and performance.
9. What are the advantages of Angular CLI commands?
Some of the best Angular CLI commands that enhances developers’ productivity are
- ng-new – Generate new Angular projects
- ng-generate – Generate components using the Angular CLI
- ng-serve – Run your app with just this command
- ng-eject – Pull the ripcord
10. Explain the difference between an Annotation and a Decorator in Angular?
Annotations in Angular are used to build annotation array. While decorators are design patterns and functions that receive the decorated object. Decorator have the ability to make modifications to the received decorated object without changing the original source code. Additionally, the sole metadata set of the class that uses the Reflect Metadata library is annotations.
Also read: Spring Boot Interview Questions
Angular scenario-based interview questions
Interviewers ask Angular scenario-based interview questions because they help ascertain the candidate’s practical knowledge and apply their theoretical understanding of Angular to real-world scenarios. Angular scenario-based interview questions for experienced professionals are an excellent way to determine if they will be a good fit for your firm.
1. How do you choose an element from a component template?
To directly access items in the view, use the @ViewChild directive. Consider an input item with a reference.
<input #example>
and construct a view child directive that is accessed in the ngAfterViewInit lifecycle hook
@ViewChild(‘example’) input;
ngAfterViewInit() {
console.log(this.input.nativeElement.value);
}
2. How do you deal with errors in observables?
Instead of depending on try/catch, which is useless in an asynchronous context, you may manage problems by setting an error callback on the observer.
Example: You may create an error callback as shown below.
myObservable.subscribe({
next(number) { console.log(‘Next number: ‘ + number)},
error(err) { console.log(‘An error received ‘ + err)}
});
Also read: Technical Interview Questions | Top 30 critical questions
Angular RxJs interview questions
Angular RxJs interview questions provide valuable insight into the applicant’s technical, problem-solving skills. Some RXJs interview questions for Angular developer are –
1. What is RxJS?
RxJS is a library for reactive Streams which can be used to deal with asynchronous data streams and events called “Reactive Extensions for JavaScript” (RxJS). RxJS uses JavaScript reactive programming. Developer use it widely because it simplifies writing asynchronous code.
2. What are RxJS Operators?
A stream is a key part of reactive programming. An operator is essentially a method that acts on an Observable and modifies the stream in some way. The function of an operator is to change or filter initially emitted values in accordance with the requirements of the project tasks.
Angular MCQ questions
MCQ questions are popular in interviews because the Angularjs objective questions offer a structured manner to evaluate a candidate’s knowledge, abilities, and understanding concepts. Angular MCQ questions can determine the candidate’s critical thinking ability. Angular 4 multiple choice questions is a great way to filter candidates in the preliminary screening process.
1. Which of the following statement is correct for AngularJS?
- AngularJS is an HTML framework
- AngularJS is a Java framework
- AngularJS is a JavaScript framework
- AngularJS is a SQL framework
Answer C = AngularJS is a JavaScript framework
2. What is the architecture platform is Angular JS based on?
- Decorator Pattern
- Observer Pattern
- MVVM architecture pattern
- MVC architecture pattern
Answer c – Angular JS is based on MVVM architectural plan or Model-View-ViewModel (MVVM) pattern.
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